Oil seal



Jan. 27, 1953 BOYD 2,626,822

OIL SEAL Filed June 25, 1945 INVENTOR.

Patented Jan. 27, 1953 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to a seal and more particularly to a unitary oil seal adapted to be inserted within the bore of a housing in encompassing relation to a rotatable or reciprocating shaft.

An object of the invention is to provide novel retainin means for a flexible packing member Within a metallic housing Another object of the invention is to provide a retaining member for a flexible packing member which is quickly and easily assembled into holding position and one which may be economically manufactured.

Other objects and advantages of the invention will more fully appear from the following description taken in connection with the accompanying drawings in which:

Fig. 1 is a longitudinal sectional view through a housing showing a portion of the improved seal inserted therein in encompassing relation to a shaft; and

Fig. 2 is an end view of the seal.

Referring to the drawings, the seal is illustrated as disposed within a housing It in encompassing relation with a shaft i2 and includes an annular housing having an outer shell l4 and an inner cup it.

The outer shell is formed having an outer axially extending flange it, an integral radially extending flange 28 and a re-entrant flange 22 extending axially from the radially extending flange it and spaced inwardly from the flange it. The inner periphery of the flange 22 forms the annular opening through which the shaft l2 extends. The inner edge of the flange 22 is turned radially outwardly forming a flange 24 which together with the flange 2% provides a channel 26.

The inner cup it has an axially extending flange 23 nested within the flange it. The edge of the flange 28 abuts the flange 2t of the cage It. The opposite end of the flange 28 is provided with an integral radially extending flange 33 which has a central openin 32 through which extends the shaft ii. The cup is held Within the cage it by a turned over flange 3 1 at the edge of the flange it.

An annular band of flexible packin material (it has one end portion 38 in the channel 253 and its opposite end portion 40 of slightly less diameter for sealing engagement with the shaft it. An intermediate portion 42 of thinner section serves as a flexible connection between the end portions to permit radial shifting of the portion it for accurate sealing relation with the shaft. The in ner periphery of the end portion it is slightly conical having a smaller diameter at its outer end for more tightly engaging the shaft.

The end portion 38 of the packing material 35 has its outer periphery formed with an arcuate groove 23 for the reception of a garter spring tit and its inner periphery projects radially inwardly for reception in the groove 25. Around the outer periphery of the end portion til is a garter spring 56 for resiliently urging the end it radially inwardly into tight sealing engagement with the shaft H2.

The parts are assembled by forcing the end portion 38 of the packing 36 over the flange 2s into the channel 25. The garter spring id is then stretched over the outer periphery of the end portion 38 and positioned in the groove G3. The radial tension of the spring it retains the end portion 33 within the channel for positively retaining the packing member 36 in position. The garter spring 46 is then placed over the outer periphery of the end portion to and the cup it is inserted in the cage M with the flange 36 thereof retaining the garter spring at in its proper position. The flange 34 is then bent over the outer edge of the flange 39 to retain the parts in assembled position.

The spring 44 is preferably stronger than the spring 56 for exerting more radial force on the packing member.

By the above arrangement of parts the seal is easily assembled and the cost of manufacture has been reduced.

It will be understood that various changes including the size, shape and arrangement of parts may be made without departing from the spirit of my invention and it is not my intention to limit its scope other than by the terms of the appended claims.

I claim:

1. A self contained sealing unit of the type described, comprising a centrally apertured sheet metal housing for pressed fit insertion within a housing about a centrally located shaft, said housing having an outer shell provided with an axially extending flange and an integral radially extending flange, a second integral axially extending flange underlyin said first axially extending flange and spaced therefrom, the end portion of said second named axially extending flange being bent radially toward said first named flange to provide a channel opening radially toward said first named axially extending flange, a flexible band of packing material having one end thereof within the channel and its opposite end projecting axially beyond the channel, and a garter spring around the outer periphery of each of said end portions of said packing, a portion of said packing material substantially mid-way between said springs of reduced thickness.

2. A self contained sealin unit of the type de scribed, .comprising a centrally apertured sheet metal casing for pressed fit insertion within a housing about a centrally located shaft, said casing having an outer shell provided with an axially extending portion and an integral radially extending flange having an integral axially extending flange underlying said axially extending casing portion and spaced therefrom, the end portion of said axially extending flange being bent radially toward said axially extending casing portion to provide a channel opening radially toward said axially extending casing portion, a flexible band of packing material having one end thereof Within the channel and. its opposite end projecting axially beyond the channel, and a garter spring around the outer periphery of each of said end portions of said packing, a portion of said packing material substantially midway between said springs being of reduced thickness.

DONALD A. BOYD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

